Crucible-furnace.



PATENTED MAY 7, 1907.

J. BORBEGK. GRUGIBLE FURNACE. APPLIOATION FILED mus, 1906.

' THE NORRIS PETERS co.. WASHINGTON. u. c.

JULIUS BORBEOK, OF ALTENA, GERMANY.

CRUClBLE-FURNACE.

Specification of Letters Patent.

Application filed July 9, 1906. Serial No. 325,350.

Patented May 7, 1907.

To all whom, it may concern:

Be it known that I, J ULIUS BORBEOK, engineer, a subject of the Emperor of Germany, residing at Altena, l/Vestphalia, Germany, have invented certain new and useful Improvements in Crucible-Furnaces, of which the following is the specification. v

In the usual construction of fixed crucible furnaces the base is formed as an annular blast channel and the air blast is introduced through lateral nozzles below the crucible.

The present invention relates to an improved construction of tipping crucible furnace whereby the said annular blast channel is applied thereto.

In the preferred construction a metal ring of trough shaped section is built into the bottom of the furnace walls and its outwardly directed open side is closed by the sheet iron casing, the ring being so formed that the distribution of the blast can be effected in two directions, namely through the usual vertical channels in the furnace walls, at the side of the crucible, and directly over the ashpit.

In order to enable the blast to be introduced uninterruptedly, which is necessary for preventing the cooling of the molten metal and for insuring a uniform casting, in particular for small articles, the trunnions, which are formed hollow in the usual manner for the supply of the blast, are connected by pipes with the annular blast channel so that the blast can be continued without interruption while tipping.

On the accompanying drawing is shown a tipping crucible furnace constructed according to this invention.

Figure 1 shows a side elevation, Fig. 2 a vertical section, Fig. 3 a plan, and Fig. 4 an elevation and plan of the annular blast channel detached.

The furnace, which is mainly constructed 1 in the usual manner, can be tipped upon the hollow trunnions a a that are carried in suitable bearings, not shown. The air blast enters through two pipes which are branched from the main blast pipe, usually situated below the floor, and are connected by stuffing boXes in the usual manner to the trunnions. From the trunnions the blast is led downward through two pipes b b o ening into the annular blast channel d which is carried by angle iron supports at the base of the furnace.

The blast channel (1 is of trough shaped section, the outwardly directed open side being closed by the furnace casing; it is closed at bottom, but has on its upper side (on which the fire clay lining rests) slots 6 through which the blast passes in the usual manner into the vertical channels of the furnace walls. The channel d has in addition inwardly directed blast nozzles, or openings f, through which a portion of the blast passes directly into the coke and smelting chamber.

It will be seen that with the described construction it is possible to continue the blast uninterruptedly in every position of the furnace and also while in motion, so as to act upon the fuel in the smelting chamber in order that the molten metal in the crucible may not cool and a uniform casting may be effected even when very small articles are to be cast, or when the casting is of long duration.

Having thus described the nature of our said invention and the best means we know of carrying the same into practical effect, we claim A tipping crucible furnace having vertical channels and a metal annular blast channel built into the furnace walls, an outwardly directed open side of said annular channel being closed by the casing of the furnace while in the top side are formed slots 6 and in the inner side openings f for the passage of the blast into said vertical channels of the furnace walls and into the smelting chamber, and

. means for supplying the blast to said annular channel.

In witness whereof I have hereunto set my hand in presence of two witnesses.

JULIUS BORBEOK. Witnesses:

OTTO KoNIG,

J. A. RITTERSHAUS. 

